Service Battery (3.7V/5.4V) Power Distribution; Figure 90. Service Power Distribution - Alcatel 1850 TSS-320 Technical Handbook

The power supply design at board level satisfy the following requirements:
– At the input power side, before the diodes OR-Ring of the two batteries rails A and B, a protection
fuse has been inserted for every battery wire (F2 in Figure 89. on page 143).
– After OR-Ring the input battery voltage, the presence of the battery power supply used in the board
is monitored. This information is sent to SLC via ISC bus.
– For each board the EMI/EMC filtering reduce the spurious frequency produced from the DC/DC
converters.

3.9.2 Service battery (3.7V/5.4V) power distribution

In addition to the main voltage rails (-48V/--60V), each PSF unit shall provide two service voltages.
a) 3.6V (V3A & V3B) distributed to all slots of the equipment (including slots for access panel
connection)
b) 5.3V (V5A & V5B) specific for WDM cards management and access panel
The duplicated 3.6V and 5.3V voltages are distributed to all cards within the subrack V3A and B as well
as V5A and B wires are combined on each card using diodes:
The service voltage wires at 3.6V and 5.3V are not fused on PSF and fused at the unit board level.
Alcatel 1850 TSS-320 Rel. 1.1
144/270 8DG 07734 AAAA Edition 01
3.6 V A
PSF A
5 V A
3.6 V B
PSF B
5 V B

Figure 90. Service power distribution

fuse
fuse
Generic slot
fuse
fuse
fuse
fuse
Slot for legacy WDM
boards
fuse
fuse
fuse
fuse
Access pane slots
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